Now playing: Watch this: Samsung Galaxy S II (T-Mobile) 1:57 Samsung, more than any other phone maker, knows how to run with a good thing. T-Mobile’s version of the Samsung Galaxy S II is the fourth of this family we’ve seen, after the unlocked version, and iterations for Sprint and AT&T. The good news is we’ve been impressed with each …

The Nexus S is one of the first smartphones to have NFC, which enables mobile payments in stores. But it’s being used by Google as its flagship device for its own payment system. Josh Miller/CNET The mobile-payments joint venture between three of the national wireless carriers has gotten the support of nearly all of the major handset manufacturers in its …

There is plenty of wireless spectrum available to meet the demand for wireless data services, but the problem may be that too much of it is in the wrong hands, according to a recent report from Citigroup. A recent report from analysts at Citigroup, titled “Wireless Data: Supply and Demand Spectrum Control, Not Availability, Is the Real Constraint,” suggests that …